Make sure your Samsung TV supports AirPlay 2
Connect your iPhone, iPad, or Mac and your Samsung TV to the same Wi-Fi network
On Samsung TV, go to Settings
Open General
Select Apple AirPlay Settings
Turn AirPlay on
On iPhone or iPad, open Control Center
Tap Screen Mirroring or AirPlay
Select your Samsung TV
Enter the AirPlay code shown on the TV if prompted
On Mac, click the Control Center or AirPlay icon in the menu bar
Select your Samsung TV
Enter the AirPlay code if prompted
To stream a video or photo, tap the AirPlay icon in the app and choose your Samsung TV